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Type: Posts; User: vjmuzik

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    The IOMUX is responsible for routing internal...

    The IOMUX is responsible for routing internal registers to external signals, just turning on VSELECT will not change to 1.8v mode. VSELECT for SD0 can be routed to one of four pins through the IOMUX,...
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    It's not rocket science, the reference manual...

    It's not rocket science, the reference manual tells you you need external circuitry, so you need external circuitry:
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    They are very much exposed pins and not just...

    They are very much exposed pins and not just internal though the only one we have exposed is AD_B1_01 which is pin 18 on the Teensy 4.1. Like I said earlier that pin would be responsible for changing...
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    The pins for VSELECT can be found in the...

    The pins for VSELECT can be found in the reference manual, which does show the external pins that it maps to, for SD0 it can be one of these 4 pins here:


    USDHC1_VSELECT
    GPIO_EMC_41 ALT6...
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    I see now it's not the SD cards power that needs...

    I see now it's not the SD cards power that needs to change it's the NVCC_SD voltage that has to change, which based on the Teensy 4 schematic is hardwired to 3.3v so currently we can't do anything...
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    I thought the SD card needs to be powered from...

    I thought the SD card needs to be powered from 1.8v as well, it is currently hardwired to 3.3v with no way to change it and from what I remember there was a pin on the processor that would toggle...
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    I'm pretty sure I remember talks of this before...

    I'm pretty sure I remember talks of this before and the problem had to do with it being hardwired at 3.3v and the pin that is supposed to make the change to 1.8v wasn't exposed anywhere.
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